PORTULACA SOCOTRANA (PORTULACACEAE) IN THE FLORA OF UKRAINE
DOI:
https://doi.org/10.58407/bht.3.25.4Keywords:
alien species, distribution, new records, Portulaca, seed surface ultrastructureAbstract
Purpose of the work. To clarify the place of Portulaca socotrana in the P. oleracea complex based on macro- and micromorphological research and to generalize its current distribution in Ukraine.
Methodology. The object of the study is P. oleracea aggr. and its intraspecific taxa. Samples from almost 450 localities of P. oleracea were studied, the materials for which were presented from the herbarium collections of Ukraine (KW, CHER, CHU, YALT, UU, LWKS) and in field collections obtained from the territories of individual regions of Ukraine. Taxa were determined based on macro- and micromorphological characteristics of seeds using a scanning electron microscope (SEM). To determine the diameter of seeds, the length of the polar and equatorial axes was measured using the AxioVision Rel.4.8 program for each seed fixed on the SEM stage.
Scientific novelty. For the first time, information on the distribution of P. socotrana in Ukraine, one of the taxa of the analyzed complex, has been summarized, 13 of its localities from Zhytomyr, Poltava, Rivne, Chernihiv regions and the Autonomous Republic of Crimea have been recorded. New locations of P. socotrana growth discovered in Ukraine indicate the expansion of its secondary range.
Conclusions. The distribution of P. socotrana in Ukraine is characterized by the sporadic nature and remoteness of the localities of the studied taxon both from the main center of origin (North-East Africa) and from localities to each other on the territory of Ukraine, which corresponds to its wide ecological amplitude. The entry of P. socotrana into the country has been observed only in recent years, which indicates its recent introduction and almost simultaneous distribution in different regions of Ukraine. In the near future, new spontaneous growth sites of plants of this taxon may appear in the regions of Ukraine, therefore, recording new localities and monitoring its further distribution and establishing its participation in various biotopes is an urgent task for further research.
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